Hopping into a hot air balloon has always seemed like one of the more conservative thrill rides available to us, less risky than, say, sky diving or swimming with sharks. Wild video out today showing a balloon crashing into power lines and exploding in front of a crowd of people is raising some serious new safety questions. ABC's Linzie Janis is on the story. Reporter: A hot air balloon flies dangerously close to power lines over this neighborhood outside Boston last night. Its passengers waving and chatting with people below. Where do you live? Right here in this yard. Reporter: But then this. Oh, my god! Reporter: Terrified residents capturing the moment of impact on their cell phones. Then 11 seconds later, another explosion. Whoa! Big flash of red in front of you and then another one a couple seconds afterwards. I've never seen anything like it. I'm still shaking. We thought they were gone. Everyone was calling 911. Reporter: Instead the passengers were seen helping each other out of the basket. According to a firefighter at the scene, five of the six suffered burns. But in may, three people died when their balloon crashed into power lines at a festival in Virginia. According to the ntsb 16 people were killed while ballooning between 2002 and 2012, most the result of collisions with power lines. It happened to former NFL player Donte Stallworth. He survived but he and a friend were left badly burned. I saw that we were getting ready close to the power lines and by the time I realized that we were going to hit the power line, it was too late. Reporter: The FAA is now investigating this latest crash and interviewed the balloon's owner. Those investigators are going to want to know why it appeared that balloon pilot was trying to land in a busy residential area. Dan? Tough to watch that video, but we're glad they're okay. Thank you.

This transcript has been automatically generated and may not be 100% accurate.

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